Security readout for executives and security teams
CVE-2019-11477 is a Linux kernel flaw where specially handled TCP SACK traffic can crash or hang a vulnerable system. The business impact is availability: exposed Linux servers, appliances, or services could be remotely disrupted without authentication. The source bundle does not show confirmed active exploitation. Exposure is most likely on systems running affected Linux kernel branches 4.4, 4.9, 4.14, 4.19, or 5.1 before the named stable fixes, especially if reachable over TCP from untrusted networks. Treat this as a high-priority availability risk for exposed Linux infrastructure. It should not outrank active exploitation or remote code execution issues, but unpatched internet-facing systems deserve rapid remediation planning. Mitigation focus: Upgrade affected kernels to fixed stable releases or vendor-patched equivalents.; Prioritize internet-facing Linux systems and network appliances using affected kernel branches.; Check distribution or appliance vendor advisories for supported mitigations when patching is delayed..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CWE-190: Exact CWE lookup
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Open ATT&CK lookupCVE-2019-11477 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 7.5 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
7.5HighVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- VU#905115CVE reference · third-party-advisory, x_refsource_CERT-VN
- RHSA-2019:1594CVE reference · vendor-advisory, x_refsource_REDHAT
- RHSA-2019:1602CVE reference · vendor-advisory, x_refsource_REDHAT
- RHSA-2019:1699CVE reference · vendor-advisory, x_refsource_REDHAT
- https://www.oracle.com/security-alerts/cpujan2020.htmlCVE reference · x_refsource_MISC
- https://www.oracle.com/security-alerts/cpuoct2020.htmlCVE reference · x_refsource_MISC
- https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=3b4929f65b0d8249f19a50245cd88ed1a2f78cffCVE reference · x_refsource_MISC
- https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.mdCVE reference · x_refsource_MISC
- https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SACKPanicCVE reference · x_refsource_MISC
- https://access.redhat.com/security/vulnerabilities/tcpsackCVE reference · x_refsource_MISC
- https://support.f5.com/csp/article/K78234183CVE reference · x_refsource_CONFIRM
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44193CVE reference · x_refsource_CONFIRM
- https://www.synology.com/security/advisory/Synology_SA_19_28CVE reference · x_refsource_CONFIRM
- https://security.netapp.com/advisory/ntap-20190625-0001/CVE reference · x_refsource_CONFIRM
- https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2019-0006CVE reference · x_refsource_CONFIRM
- https://kc.mcafee.com/corporate/index?page=content&id=SB10287CVE reference · x_refsource_CONFIRM
- https://cert-portal.siemens.com/productcert/pdf/ssa-462066.pdfCVE reference · x_refsource_CONFIRM
- https://www.us-cert.gov/ics/advisories/icsa-19-253-03CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Integer Overflow or Wraparound
Integer Overflow or Wraparound represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.